The right of way for your fence needs to be as smooth as possible with the center in line with the fence line. This will allow you access inside and out for maintenance. One mistake many people make is to place the fence under the branch line of trees. A fallen branch can do as much damage as a fallen tree. Don't forget to consider drainage. Hydraulic forces are very strong and if the fence is placed in an area that sees high volumes of water during storms, then you are likely to have a maintenance headache. Don't "cheap-out" on materials or construction. In the long run they will prove to be a good investment. Corners should be double "H" braced with diagonal reinforcement, and welded, not clamped connections. A good idea is to place a strand of #9 wire 6-8" above the top of the fence. This will deflect small branches and prevent damage to the fence. ELECTRIC wire or a fence apron is a must to keep out the dogs and preditors. Use a top quality fence, i recommend Stay-Tuff, but Beackhart is another brand that is satisfactory. If you plan to put the fence up yourself, be prepared to work at it. Fencing is a tough job, so you may want to consider getting a pro to do it for you, Right now, the cost of 8' fencing installed runs about $23,000 per mile. Good Luck